275 is an older card so it`s hard to find a comparison like this on teh web. Is the 630 better and if so by how much ? This is just for flash games and playing avi files so don`t sugeest any other cards thx.

A GT 630 is a re-branded GT 440.
Here is a comparison between a GT 440 (GT 630) and a GTX 260 (so your GTX 275 is even faster).http://www.anandtech.com/bench/Product/610?vs=664
As you can see, the GTX 260 is way faster, but consumes way more! Since it says in your system specs that you already have the GTX 275, I would suggest you to keep it.

Is there an iGPU in your CPU? I would just use that. If you're just playing flash games, I doubt your GPU will even be used. I suppose if it's just sitting there at idle all the time it's not going to use much power anyways.

It largely depends on what are you going to use it for. The GT 630 comes with HDMI 1.4a which can stream 3D movies and games as well as act like an ethernet to your TV. GTX 275 has an older generation HDMI- for the differences check out Wikipedia topic about it. If gaming/rendering/animating is your primary concern then GTX 275. If everyday use, low electricity use and size are what matters get GT 630. By the look of your original post I feel you would be better with the GT 630.

The GTX275 would be faster than the GT630 on older gen games. But like erocker said the 630 will consume less power. The gtx275 is only a DX10 based card and the gt630 is DX11. One thing to remember is that the gt630 isn't going to play dx11 games that well. My brother is gaming on a GTX285 and it plays all his games well. So, with a little over clock you could get close to the same performance of a GTX285. I'd get the GTX275 over the GT630 for gaming. If you are just going to be playing web based games and surfing and watching videos then the gt630 over the gtx275.

Get whichever one is cheaper. You are only watching videos and playing Flash games. Very very little power is actually needed for that. You should honestly just get a $40 to $50 GPU if that is all the computer will be doing from now on.

actually in dx10 alone the current gpu equivalent would be 7770-gtx 650 ti(that's alittle better) or a heavily oc'ed 7750/gtx650;
its funny to see some of the coments (not yours in particular), people think new cards are soo much better than the high end from last gens(even low end ones like gt 630) wich are not.

actually in dx10 alone the current gpu equivalent would be 7770-gtx 650 ti(that's alittle better) or a heavily oc'ed 7750/gtx650; its funny to see some of the coments (not yours in particular), people think new cards are soo much better than the high end from last gens(even low end ones like gt 630) wich are not.

Exactly.. I don't get that either.. A GTX275 will smoke that GT630 in DX9/DX10 games.. Now the obvious win in DX11 is the GT630 only because the GTX275 won't play DX11, but with that being said hell a gt630 isn't going to play DX11 that well. I wouldn't get anything less than a GTX650 ti... If he wants a 6 series card for gaming.

630 is slower indeed, but it's a much more efficient GPU (has more features too) and it's surely enough for some flash gaming (even an modern IGP would be enough tbh). The 275 was a high-end GPU, it would be an overkill for flash games.